Reamer.



.110. 780,010. 19.0111111011 FEB. 00,` 1905. H. 0. B11011011.

BEAMER.

APPLIOATION FILED 0012.01, 1004.

y; Henry C/mnaz ,gr \u ne. reame.

lfatented February 28, 1905.

FC l m HENRY CONRAD BEAMER, OF CHESVVICK, PENNSY'JVANA.

SPECIFGATION forming part of Letters PatentNo. 783,816, dated February28, 1905.

Application filed October 31,1904. Serial No. 230,727.

To rl/ZZ wiz/0771, it 1n/(ty coincer/t.-

Be it known'that l, HENRY CONRAD BEAMER, a citizen of the United States,and a resident of Cheswick, in the county of Allegheny and State ofPennsylvania, have invented a new and flmproved Reamer, of which thefollowing' is a full, clear, and exact description.

This invention relates to reamers; and it consists in the constructionand combination of parts hereinafter described and claimed.

ln mining operations where holes are bored for the purpose of blastingsome of the etliciency of the blast is lost by the escape of the gasesat the time of the explosion throug'h the opening leading to thesurface. .lt has been sought to overcome this diiiiculty by enlargingthe bore of the hole at the bottom thereof at the point where theexplosion takes place, the purpose being to afford a relativelyrestricted outlet, which conduces toward a more complete inclosure ofthe gases after the eX- plosion.

The object of this invention is to produce a device of simpleconstruction which will operate in connection with an ordinary drill orauger for the purpose of enlarging an opening' or hole produced by thedrill.

ln its construction the device comprises a chuck in which a pair ofoppositely-disposed cutters or bits are pivoted. As the device isadvanced the points of these bits diverge, so as to cut an enlargedchamber.

The special object of this invention is to simplify the construction andmeans for mounting the bits in the chuck and limiting the divergingmovement thereof.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a perspective of the device, repn resenting the same asdetached from the end of a drill. Fig. 2 is a section supposed to betaken through a vein and representing an ordinary drill in process offorming a hole :for the blast charge. Fig. 3 is a view similar to Fig.2, but representing a drill provided with my device, showing the sameentering' a hole for the purpose of rcaming or enlarging the Fig. 4 is aview similar to same at its base.

shown in full lines in Fig. 5.

Figs. 2 and 3, but representing my device in operation and illustratingthe enlarged chamber which it forms; and Fig. 5 is a longitudinalcentral section taken through the device, representing the bits in theirnormal closed position in full lines, the bits being rem'esented intheir open or divergent position in dotted lines.

Referring more particularly to the parts, 1 represents the body or chuckof the reamer. 1t consists, preferably, of a thick flat plate, which iscut away centrally on its opposite edges, so as to form a pair ofrecesses or throats 2 and 3. ln the throat 2, near the outer edge 4thereof, a pair of oppositely-disposed cutters or bits 5 are pivotallymounted upon pins 6, as indicated most clearly in Fig. 5. The bits 5 arepreferably of substantially triangular form, as indicated in Fig. 5, andtheir outer edges 7 are normally disposed sul stantially parallel withthe side edges S of the body 1., as shown. '.l he outer extremities ofthe hits terminate in sharp points S), and the inner or adjacent edges10 of the bits are preferably curved and converge toward eachother, asindicated, passing into the space between the pivot-pins G. From a point1l lying' substantially upon a line joining the pivots 6 the rear edgesor cheeks 12 of the bits diverge rearwardly, and these edges l2 meet theaforesaid edges 7 in points 13, as indicated. rlhe edges 10 arepreferably beveled and disposed in an opposite relation, the purpose ofthis bevel being to facilitate the cutting operation at the points 9.The bits normally occupy substantially the position in which they areThe points 9 are prevented from ap1 )1'oacliing more nearly to eachother by means of projections or stops llt, which project into thethroat 2, as will be readily understood.

On the central longitudinal axis of the body 1 a main stop pin or stud15 is located, andv this stop is adapted to cooperate with the bits inorder to limit their movement and to inf) sure that the pointst) willdispose themselves at the same distance from the axis when they havediverged to their fullest extent. In the edges 12 at suitable points thesame are provided with recesses 1li, which receive said IOO stop-pin 15in the manner indicated in dotted lines in Fig. 5, at the same timeallowing the faces or edges l2 to come against each other. ln this waywhile the stud 15 does operate as a stop it is substantially relieved ofall pressure tending to break it off, because the forces on the oppositesides of the same equalize each other. In this manner the bits are madeto arrest their own movement and constitute opposed stops for eachother.

When operating with the device, a vein 17, such as that indicated inFig. 2, would be bored into with a drill 18, so as to form an opening orhole 19. Drills used for this purpose usually have oppositely-disposedseparated points 20, with diverging cutting edges 21. As these points 2Orotate they of course operate to form a conical base or nipple 22 at thebottom of the opening. The presence of this base or nipple 22 isutilized to cause the bits 5 of my device to expand. The reamer is to beattached to the extremity of the drill and introduced into the openingin the manner indicated in Fig. 3, it being understood that when thebits are in their contracted or folded position they may be readilyTintroduced into the opening. When the reamer reaches the bottom of theopening and the drill 18 is rotated, the pressure of the base Q2 betweenthe bits at the edges lO operates to force them outwardly, so thatintheir rotation they will form an enlarged chamber 23, such as thatindicated in Fig. 4; The diameter of this chamber is of coursedetermined by the limit to which the points 9 of the bits may diverge.When the chamber 23 has been given sufficient depth, the drill and thereamer may be readily withdrawn from the opening, as the bits willeasily return to their normal folded relation.

The end of the drill 18 is preferably attached to the body l of thereamer by inserting its end in the throat 3 aforesaid and securing thesame therein by means of suitable fastening devices, such as the screws24E, seating in suitable openings 25 in the body.

While l prefer to make the body 1 of the device of substantiallyrectangular form, as shown, in practice, where found desirable, thisbody cou-ld be made of cylindrical form, and this latter form willusually be adopted where other means were not provided for insuring aproper centering of the device in the drill-hole. Of course such meansare unnecessary with the form of drill shown, as the body of the drillassists in centering' the device.

Having 'rh us described my invention, l claim as new and desire tosecure by Letters Patent4 1. In a device of the class described, incombination, a body presenting a throat, pivotpins disposed across saidthroat, a pair of oppositely-disposed bits pivotal] mounted on said pinsand in said throat and having points adapted to diverge as said bitsrotate upon their pivots, said bits having rear faces adapted to abutsubstantially upon'the central axis of said bod yand a stud upon saidcentral axis and limiting the inward movement of said faces.

2. ln a device of the class described, in combination, a body presentinga throat, a pair of oppositely-disposed bits mounted upon pivots in saidthroat, said bits having points adapted to diverge as said bits rotateupon said pivots, said bits further having cutting edges converging fromthe points theleofinto the space between said pivots and rear facesformed on lines passing from a point lying substantially centrallybetween said pivots, said faces having oppositely-disposed recesses,astud mounted in said throat upon the central axis of said body andadapted to engage said recesses, and a pair of stops near the outeredges of said `throat and limiting the inward movement of said points.

3. In a device of the class described, in combination, a body presentinga throat, a pair of oppositely-disposed bits mounted upon pivots in saidthroat, said bits having points adapted to diverge as said bits rotateupon said pivots, said bits further having cutting edges coni verging'from the points thereof into the space between said pivots and rearfaces formed on lines passing from a point lying substantially centrallybetween said pivots, said faces having oppositely-disposed recesses,astud mounted in said throat upon the central axis of said body andadapted to engage said recesses, a pair of stops near the outer edges ofsaid throat and limiting the inward movement of said points, and meansfor attaching said body to a drill.

ln testimony whereof l have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY CONRAD BRAMER. l/Vitnesses:

GEORGE B. UoUcH, J. R. MoRRrs.

IOO

